Liquid laundry detergent composition

ABSTRACT

Liquid laundry detergent compositions including hydroxyethylcellulose and carboxymethylcellulose.

FIELD OF THE INVENTION

The present disclosure relates to liquid laundry detergent compositions comprising hydrophobically modified hydroxethylcellulose and carboxymethylcellulose.

BACKGROUND OF THE INVENTION

It is preferred to formulate liquid laundry detergent compositions that provide both fabric cleaning and softening benefits. Hydroxyethylcellulose provides such softening benefits when formulated into liquid laundry detergent compositions. However, the presence of the hydroxyethylcellulose can detrimentally affect the overall fabric whiteness benefits provided by the liquid laundry detergent composition.

It was surprisingly found that the addition of carboxymethylcellulose together with the hydroxethylcellulose provided an acceptable fabric whiteness benefit whilst still maintaining the softening benefit.

However, a further issue was encountered when the hydroxethylcellulose and carboxymethylcelluose were added to liquid laundry detergent compositions. It was found that the hydroxethylcellulose and the carboxymethylcellulose had a tendency to ‘swell’ due to interaction with the surrounding liquid composition. This swelling results in an increase in the viscosity of the composition making it difficult to pour in use and also handle during manufacture.

Therefore there is a need for a liquid laundry detergent composition comprising both hydroxyethylcellulose and carboxymethylcellulose that retains acceptable rheology.

It was surprisingly found that the composition of the present invention overcame this technical problem.

SUMMARY OF THE INVENTION

The present disclosure relates to a liquid laundry detergent composition comprising an anionic surfactant, a hydroxethylcellulose, a carboxymethylcelluose and an alcohol, wherein the composition is obtained by the following steps;

-   -   a. Preparing a first composition comprising the anionic         surfactant;     -   b. Preparing a second composition by mixing the alcohol, the         hydroxyethylcellulose and the carboxymethylcellulose;     -   c. Adding the second composition to the first composition to         make the liquid laundry detergent composition.

wherein the alcohol has a molecular weight of between 20 and 400 and an eRH of between 70% and 100% at 20° C. as measured via the alcohol eRH test described herein.

The present disclosure also relates to a liquid laundry detergent composition comprising an anionic surfactant, a hydroxethylcellulose, a carboxymethylcelluose and an alcohol, wherein the composition is obtained by the following steps;

-   -   a. Preparing a first composition comprising the anionic         surfactant;     -   b. Preparing a second composition by mixing the alcohol, the         hydroxyethylcellulose and the carboxymethylcellulose;     -   c. Adding the second composition to the first composition to         make the liquid laundry detergent composition.

wherein the alcohol is selected from the group comprising ethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, 2,3-butane diol, 1,3 butanediol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerol formal dipropylene glycol, dipropylene glycol methyl ether, propylene glycol monopropyl ether, tripropylene glycol, polypropylene glycol, dipropylene glycol n-butyl ether, and mixtures thereof, preferably the alcohol is selected from the group comprising dipropylene glycol methyl ether, dipropylene glycol, polypropylene glycol, 2,3-butane diol, dipropylene glycol n-butyl ether and mixtures thereof.

The present disclosure also relates to a concentrated polymer composition suitable for addition to a laundry detergent composition comprising;

-   -   a. 10% to 30% preferably between 15% and 25% by weight of the         polymer composition of a hydroxyethylcellulose;     -   b. A carboxymethylcellulose in a weight ratio of hydroxyethyl         cellulose to carboxymethylcellulose of between 1:0.7 and 1:2,         preferably between 1:1 and 1:1.5;     -   c. An alcohol, wherein the alcohol has a molecular weight of         between 20 and 400 and an eRH of between 70% and 100% at 20° C.         as measured via the alcohol eRH test described herein.

The present disclosure also relates to a concentrated polymer composition suitable for addition to a laundry detergent composition comprising;

-   -   a. 10% to 30% preferably between 15% and 25% by weight of the         polymer composition of a hydroxyethylcellulose;     -   b. A carboxymethylcellulose in a weight ratio of hydroxyethyl         cellulose to carboxymethylcellulose of between 1:0.7 and 1:2,         preferably between 1:1 and 1:1.5;

c. An alcohol selected from the group comprising ethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, 2,3-butane diol, 1,3 butanediol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerol formal dipropylene glycol, dipropylene glycol methyl ether, propylene glycol monopropyl ether, tripropylene glycol, polypropylene glycol, dipropylene glycol n-butyl ether, and mixtures thereof, preferably the alcohol is selected from the group comprising dipropylene glycol methyl ether, dipropylene glycol, polypropylene glycol, 2,3-butane diol, dipropylene glycol n-butyl ether and mixtures thereof.

DETAILED DESCRIPTION OF THE INVENTION Liquid Laundry Detergent Composition

The present disclosure relates to a liquid laundry detergent composition comprising an anionic surfactant, a hydroxethylcellulose, a carboxymethylcelluose and an alcohol.

The term ‘liquid laundry detergent composition’ refers to any laundry detergent composition comprising a liquid capable of wetting and treating fabric e.g., cleaning clothing in a domestic washing machine, and includes, but is not limited to, liquids, gels, pastes, dispersions and the like. The liquid composition can include solids or gases in suitably subdivided form, but the liquid composition excludes forms which are non-fluid overall, such as tablets or granules.

The liquid composition may be formulated into a unit dose article. The unit dose article of the present invention comprises a water-soluble film which fully encloses the liquid composition in at least one compartment. Suitable unit dose articles are described in more detail below.

The liquid laundry detergent composition can be used as a fully formulated consumer product, or may be added to one or more further ingredient to form a fully formulated consumer product. The liquid laundry detergent composition may be a ‘pre-treat’ composition which is added to a fabric, preferably a fabric stain, ahead of the fabric being added to a wash liquor.

The liquid laundry detergent composition can be used in a fabric hand wash operation or may be used in an automatic machine fabric wash operation.

The composition is obtained by the following steps;

-   -   a. Preparing a first composition comprising the anionic         surfactant;     -   b. Preparing a second composition by mixing the alcohol, the         hydroxyethylcellulose and the carboxymethylcellulose;     -   c. Adding the second composition to the first composition to         make the liquid laundry detergent composition.

Without wishing to be bound by theory, it is believed that the technical problem addressed by the present invention is overcome by the specific sequence of steps used to make the composition including the formation of first and second compositions.

The first and second compositions are described in more detail below.

The present invention is also to a concentrated polymer composition suitable for addition to a laundry detergent composition comprising;

-   -   a. 10% to 30% preferably between 15% and 25% by weight of the         polymer composition of a hydroxyethylcellulose;     -   b. A carboxymethylcellulose in a weight ratio of hydroxyethyl         cellulose to carboxymethylcellulose of between 1:0.7 and 1:2,         preferably between 1:1 and 1:1.5;     -   c. An alcohol.

The hydroxyethylcellulose is described in more detail below. The carboxymethylcellulose is described in more detail below.

The composition of the present invention may comprise an adjunct ingredient, preferably wherein the adjunct ingredient is selected from the group comprising bleach, bleach catalyst, dye, hueing dye, aesthetic dyes, cleaning polymers including alkoxylated polyamines and polyethyleneimines, surfactant, solvent, dye transfer inhibitors, chelant, perfume, encapsulated perfume, and mixtures thereof.

First Composition

The first composition comprises the anionic surfactant. Preferably, the first composition comprises between 10% and 50%, more preferably between 15% and 45% by weight of the first composition of anionic surfactant. Preferably, the anionic surfactant is selected from linear alkylbenzene sulphonate, alkoxylated alkyl sulphate or mixtures thereof. The anionic surfactant is described in more detail below.

The first composition may comprise an adjunct ingredient selected from the group comprising bleach, bleach catalyst, dye, hueing dye, aesthetic dyes, cleaning polymers including alkoxylated polyamines and polyethyleneimines, surfactant, solvent, dye transfer inhibitors, chelant, perfume, encapsulated perfume, and mixtures thereof.

Second Composition

The second composition comprises the alcohol, the hydroxyethylcellulose and the carboxymethylcellulose. The alcohol, hydroxyethylcellulose and the carboxymethylcellulose can be mixed in any order of addition.

Preferably, the second composition comprises between 10% and 30%, preferably between 15% and 25% by weight of the second composition of the hydroxyethylcellulose.

Preferably, the weight ratio of the hydroxyethyl cellulose to the carboxymethylcellulose is between 1:0.7 and 1:2, preferably between 1:1 to 1:1.5.

The hydroxyethylcellulose, the carboxymethylcellulose and the alcohol are described in more detail below.

Preferably, the second composition comprises between 40% and 70%, more preferably between 50% and 65% by weight of the second composition of the alcohol.

Another aspect of the present invention is a concentrated polymer composition suitable for addition to a laundry detergent composition comprising;

-   -   a. 10% to 30% preferably between 15% and 25% by weight of the         polymer composition of a hydroxyethylcellulose;     -   b. A carboxymethylcellulose in a weight ratio of hydroxyethyl         cellulose to carboxymethylcellulose of between 1:0.7 and 1:2,         preferably between 1:1 and 1:1.5;     -   c. An alcohol.

Anionic Surfactant

The anionic surfactant may be selected from linear alkybenzene sulphonate, alkoxylated alkyl sulphate, fatty acid or mixtures thereof.

Exemplary linear alkylbenzene sulphonates are C₁₀-C₁₆ alkyl benzene sulfonic acids, or C₁₁-C₁₄ alkyl benzene sulfonic acids. By ‘linear’, we herein mean the alkyl group is linear.

The alkoxylated alkyl sulphate anionic surfactant may be a C₁₀-C₁₈ alkyl ethoxy sulfate (AE_(x)S) wherein x is an average degree of ethoxylation of from 0.5 to 30, preferably between 1 and 10, more preferably between 1 and 5.

The term ‘fatty acid’ includes fatty acid or fatty acid salts. The fatty acids are preferably carboxylic acids which are often with a long unbranched aliphatic tail, which is either saturated or unsaturated. Suitable fatty acids include ethoxylated fatty acids. Suitable fatty acids or salts of the fatty acids for the present invention are preferably sodium salts, preferably C12-C18 saturated and/or unsaturated fatty acids more preferably C12-C14 saturated and/or unsaturated fatty acids and alkali or alkali earth metal carbonates preferably sodium carbonate.

Preferably the fatty acids are selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid, topped palm kernel fatty acid, coconut fatty acid and mixtures thereof.

Hydroxyethylcellulose

The composition of the present invention comprises a hydroxyethylcellulose.

The hydroxyethylcellulose may comprise a hydrophobically modified hydroxyethylcellulose. By ‘hydrophobically modified’, we herein mean that one or more hydrophobic groups are bound to the polymer backbone. The hydrophobic group may be bound to the polymer backbone via an alkylene group, preferably a C₁₋₆ alkylene group.

Preferably, the hydrophobic group is selected from linear or branched alkyl groups, aromatic groups, polyether groups, or a mixture thereof.

The hydrophobic group may comprise an alkyl group. The alkyl group may have a chain length of between C₈ and C₅₀, preferably between C₈ and C₂₆, more preferably between C₁₂ and C₂₂, most preferably between C₁₆ and C₂₀.

The hydrophobic group may comprise a polyalkylene glycol, preferably wherein the polalkylene glycol is selected from polyethylene glycol, polypropylene glycol, or a mixture thereof. The polyethylene glycol may comprise a copolymer comprising oxyethylene and oxypropylene units. The copolymer may comprise between 2 and 30 repeating units, wherein the terminal hydroxyl group of the polyalkylene glycol is preferably esterified or etherized. Preferably, the ester bond is formed with an acid selected from a C₅₋₅₀ carboxylic acid, preferably C₈₋₂₆ carboxylic acid, more preferably C₁₆₋₂₀ carboxylic acid, and wherein the ether bond is preferably formed with a C₅₋₅₀ alcohol, more preferably C₈₋₂₆ alcohol, most preferably a C₁₆₋₂₀ alcohol.

The hydroxyethyl cellulose may be derivatised with trimethyl ammonium substituted epoxide. The polymer may have a molecular weight of between 100,000 and 800,000 daltons.

The hydroxyethyl cellulose may have repeating substituted anhydroglucose units that correspond to the general Structural Formula I as follows:

wherein:

-   a. m is an integer from 20 to 10,000 -   b. Each R4 is H, and R¹, R², R³ are each independently selected from     the group consisting of: H; C₁-C₃₂ alkyl; C₁-C₃₂ substituted alkyl,     C₅-C₃₂ or C₆-C₃₂ aryl, C₅-C₃₂ or C₆-C₃₂ substituted aryl or C₆-C₃₂     alkylaryl, or C₆-C₃₂ substituted alkylaryl, and

Preferably, R¹, R², R³ are each independently selected from the group consisting of: H; C₁-C₄ alkyl;

and mixtures thereof;

wherein:

n is an integer selected from 0 to 10 and

Rx is selected from the group consisting of: H;

preferably Rx has a structure selected from the group consisting of: H;

wherein A⁻ is a suitable anion. Preferably, A⁻ is selected from the group consisting of: Cl⁻, Br⁻, I⁻, methylsulfate, ethylsulfate, toluene sulfonate, carboxylate, and phosphate;

Z is selected from the group consisting of carboxylate, phosphate, phosphonate, and sulfate.

q is an integer selected from 1 to 4;

each R₅ is independently selected from the group consisting of: H; C₁-C₃₂ alkyl; C₁-C₃₂ substituted alkyl, C₅-C₃₂ or C₆-C₃₂ aryl, C₅-C₃₂ or C₆-C₃₂ substituted aryl, C₆-C₃₂ alkylaryl, C₆-C₃₂ substituted alkylaryl, and OH. Preferably, each R₅ is selected from the group consisting of: H, C₁-C₃₂ alkyl, and C₁-C₃₂ substituted alkyl. More preferably, R₅ is selected from the group consisting of H, methyl, and ethyl.

Each R₆ is independently selected from the group consisting of: H, C₁-C₃₂ alkyl, C₁-C₃₂ substituted alkyl, C₅-C₃₂ or C₆-C₃₂ aryl, C₅-C₃₂ or C₆-C₃₂ substituted aryl, C₆-C₃₂ alkylaryl, and C₆-C₃₂ substituted alkylaryl. Preferably, each R₆ is selected from the group consisting of: H, C₁-C₃₂ alkyl, and C₁-C₃₂ substituted alkyl.

Each T is independently selected from the group: H,

wherein each v in said polysaccharide is an integer from 1 to 10. Preferably, v is an integer from 1 to 5. The sum of all v indices in each Rx in said polysaccharide is an integer from 1 to 30, more preferably from 1 to 20, even more preferably from 1 to 10. In the last

group in a chain, T is always an H.

Alkyl substitution on the anhydroglucose rings of the polymer may range from 0.01% to 5% per glucose unit, more preferably from 0.05% to 2% per glucose unit, of the polymeric material.

The hydroxyethylcellulose may be lightly cross-linked with a dialdehyde, such as glyoxal, to prevent forming lumps, nodules or other agglomerations when added to water at ambient temperatures.

The polymers of Structural Formula I likewise include those which are commercially available and further include materials which can be prepared by conventional chemical modification of commercially available materials. Commercially available cellulose polymers of the Structural Formula I type include those with the INCI name Polyquaternium 10, such as those sold under the trade names: Ucare Polymer JR 30M, JR 400, JR 125, LR 400 and LK 400 polymers; Polyquaternium 67 such as those sold under the trade name Softcat SK™, all of which are marketed by Amerchol Corporation, Edgewater N.J.; and Polyquaternium 4 such as those sold under the trade name: Celquat H200 and Celquat L-200, available from National Starch and Chemical Company, Bridgewater, N.J. Other suitable polysaccharides include hydroxyethyl cellulose or hydoxypropylcellulose quaternized with glycidyl C₁₂-C₂₂ alkyl dimethyl ammonium chloride. Examples of such polysaccharides include the polymers with the INCI names Polyquaternium 24 such as those sold under the trade name Quaternium LM 200 by Amerchol Corporation, Edgewater N.J .

Carboxymethylcellulose

The carboxymethyl cellulose may have a degree of carboxymethyl substitution from 0.5 to 0.9 and a molecular weight from 100,000 Da to 300,000 Da.

The carboxymethyl cellulose may have a degree of substitution (DS) of from 0.01 to 0.99 and a degree of blockiness (DB) such that either DS+DB is of at least 1.00 or DB+2DS−DS² is at least 1.20. The substituted carboxymethyl cellulose can have a degree of substitution (DS) of at least 0.55. The carboxymethyl cellulose can have a degree of blockiness (DB) of at least 0.35. The substituted cellulosic polymer can have a DS+DB, of from 1.05 to 2.00.

Alcohol

The alcohol has a molecular weight of between 20 and 400 and an eRH of between 70% and 100% preferably between 75% and 98% at 20° C. as measured via the alcohol eRH test described herein.

The alcohol eRH test comprises the steps of preparing a solution of 80% alcohol in deionised water, followed by adding this to a calibrated Rotronic Hygrolab meter (in a plastic sample liner of 14 mm depth) at room temperature (20° C.+/−1° C.) and allowing this to equilibrate for 25 minutes, and finally measuring the eRH recorded. The volume of sample used was sufficient to fill the plastic sample liner.

By ‘alcohol’ we herein mean either a single compound or a mixture of compounds that when taken together collectively each have a molecular weight of between 20 and 400 and an overall eRH of the compound or mixture of between 70% and 100% at 20° C. as measured via the eRH test. Without wishing to be bound by theory, an alcohol is any compound comprising at least one OH unit, preferably polyols and diols, more preferably diols. Preferred diols included glycols.

Preferably, the alcohol may be selected from the group comprising ethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, 2,3-butane diol, 1,3 butanediol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerol formal dipropylene glycol, dipropylene glycol methyl ether, propylene glycol monopropyl ether, tripropylene glycol, polypropylene glycol, dipropylene glycol n-butyl ether, and mixtures thereof.

More preferably, the alcohol may be selected from the group comprising ethylene glycol, 2,3-butane diol, 1,3 butanediol, triethylene glycol, polyethylene glycol, glycerol formal dipropylene glycol, dipropylene glycol methyl ether, polypropylene glycol, dipropylene glycol n-butyl ether, and mixtures thereof.

Even more preferably the alcohol is selected from the group comprising, dipropylene glycol methyl ether, dipropylene glycol, polypropylene glycol, 2,3-butane diol, dipropylene glycol n-butyl ether and mixtures thereof.

More preferably the alcohol may be selected from the group comprising, dipropylene glycol methyl ether, dipropylene glycol, polypropylene glycol, dipropylene glycol n-butyl ether and mixtures thereof.

Most preferably the alcohol may be selected from the group comprising, polypropylene glycol, dipropylene glycol methyl ether, dipropylene glycol n-butyl ether and mixtures thereof.

One aspect of the present invention is a liquid laundry detergent composition comprising an anionic surfactant, a hydroxethylcellulose, a carboxymethylcelluose and an alcohol, wherein the composition is obtained by the following steps;

-   -   a. Preparing a first composition comprising the anionic         surfactant;     -   b. Preparing a second composition by mixing the alcohol, the         hydroxyethylcellulose and the carboxymethylcellulose;     -   c. Adding the second composition to the first composition to         make the liquid laundry detergent composition.

wherein the alcohol is selected from the group comprising ethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, 2,3-butane diol, 1,3 butanediol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerol formal dipropylene glycol, dipropylene glycol methyl ether, propylene glycol monopropyl ether, tripropylene glycol, polypropylene glycol, dipropylene glycol n-butyl ether, and mixtures thereof, preferably the alcohol is selected from the group comprising dipropylene glycol methyl ether, dipropylene glycol, polypropylene glycol, 2,3-butane diol, dipropylene glycol n-butyl ether and mixtures thereof.

One aspect of the present invention is a concentrated polymer composition suitable for addition to a laundry detergent composition comprising;

-   -   a. 10% to 30% preferably between 15% and 25% by weight of the         polymer composition of a hydroxyethylcellulose;     -   b. A carboxymethylcellulose in a weight ratio of hydroxyethyl         cellulose to carboxymethylcellulose of between 1:0.7 and 1:2,         preferably between 1:1 and 1:1.5;     -   c. An alcohol selected from the group comprising ethylene         glycol, tetramethylene glycol, pentamethylene glycol,         hexamethylene glycol, 2,3-butane diol, 1,3 butanediol,         diethylene glycol, triethylene glycol, polyethylene glycol,         glycerol formal dipropylene glycol, dipropylene glycol methyl         ether, propylene glycol monopropyl ether, tripropylene glycol,         polypropylene glycol, dipropylene glycol n-butyl ether, and         mixtures thereof, preferably the alcohol is selected from the         group comprising dipropylene glycol methyl ether, dipropylene         glycol, polypropylene glycol, 2,3-butane diol, dipropylene         glycol n-butyl ether and mixtures thereof.

Water-Soluble Unit Dose Article

The present invention is also to a water-soluble unit dose article comprising a water-soluble film and the liquid laundry detergent composition of the present invention. The water-soluble unit dose article comprises at least one water-soluble film shaped such that the unit-dose article comprises at least one internal compartment surrounded by the water-soluble film. The at least one compartment comprises the liquid laundry detergent composition. The water-soluble film is sealed such that the liquid laundry detergent composition does not leak out of the compartment during storage. However, upon addition of the water-soluble unit dose article to water, the water-soluble film dissolves and releases the contents of the internal compartment into the wash liquor.

The compartment should be understood as meaning a closed internal space within the unit dose article, which holds the composition. Preferably, the unit dose article comprises a water-soluble film. The unit dose article is manufactured such that the water-soluble film completely surrounds the composition and in doing so defines the compartment in which the composition resides. The unit dose article may comprise two films. A first film may be shaped to comprise an open compartment into which the composition is added. A second film is then laid over the first film in such an orientation as to close the opening of the compartment. The first and second films are then sealed together along a seal region. The film is described in more detail below.

The unit dose article may comprise more than one compartment, even at least two compartments, or even at least three compartments. The compartments may be arranged in superposed orientation, i.e. one positioned on top of the other. Alternatively, the compartments may be positioned in a side-by-side orientation, i.e. one orientated next to the other. The compartments may even be orientated in a ‘tyre and rim’ arrangement, i.e. a first compartment is positioned next to a second compartment, but the first compartment at least partially surrounds the second compartment, but does not completely enclose the second compartment. Alternatively one compartment may be completely enclosed within another compartment.

Wherein the unit dose article comprises at least two compartments, one of the compartments may be smaller than the other compartment. Wherein the unit dose article comprises at least three compartments, two of the compartments may be smaller than the third compartment, and preferably the smaller compartments are superposed on the larger compartment. The superposed compartments preferably are orientated side-by-side.

In a multi-compartment orientation, the composition according to the present invention may be comprised in at least one of the compartments. It may for example be comprised in just one compartment, or may be comprised in two compartments, or even in three compartments.

The film of the present invention is soluble or dispersible in water. The water-soluble film preferably has a thickness of from 20 to 150 micron, preferably 35 to 125 micron, even more preferably 50 to 110 micron, most preferably about 76 micron.

Preferably, the film has a water-solubility of at least 50%, preferably at least 75% or even at least 95%, as measured by the method set out here after using a glass-filter with a maximum pore size of 20 microns:

5 grams±0.1 gram of film material is added in a pre-weighed 3 L beaker and 2 L±5 ml of distilled water is added. This is stirred vigorously on a magnetic stirrer, Labline model No. 1250 or equivalent and 5 cm magnetic stirrer, set at 600 rpm, for 30 minutes at 30° C. Then, the mixture is filtered through a folded qualitative sintered-glass filter with a pore size as defined above (max. 20 micron). The water is dried off from the collected filtrate by any conventional method, and the weight of the remaining material is determined (which is the dissolved or dispersed fraction). Then, the percentage solubility or dispersability can be calculated.

Preferred film materials are preferably polymeric materials. The film material can, for example, be obtained by casting, blow-moulding, extrusion or blown extrusion of the polymeric material, as known in the art.

Preferred polymers, copolymers or derivatives thereof suitable for use as pouch material are selected from polyvinyl alcohols, polyvinyl pyrrolidone, polyalkylene oxides, acrylamide, acrylic acid, cellulose, cellulose ethers, cellulose esters, cellulose amides, polyvinyl acetates, polycarboxylic acids and salts, polyaminoacids or peptides, polyamides, polyacrylamide, copolymers of maleic/acrylic acids, polysaccharides including starch and gelatine, natural gums such as xanthum and carragum. More preferred polymers are selected from polyacrylates and water-soluble acrylate copolymers, methylcellulose, carboxymethylcellulose sodium, dextrin, ethylcellulose, hydroxyethyl cellulose, hydroxypropyl methylcellulose, maltodextrin, polymethacrylates, and most preferably selected from polyvinyl alcohols, polyvinyl alcohol copolymers and hydroxypropyl methyl cellulose (HPMC), and combinations thereof. Preferably, the level of polymer in the pouch material, for example a PVA polymer, is at least 60%. The polymer can have any weight average molecular weight, preferably from about 1000 to 1,000,000, more preferably from about 10,000 to 300,000 yet more preferably from about 20,000 to 150,000.

Mixtures of polymers can also be used as the pouch material. This can be beneficial to control the mechanical and/or dissolution properties of the compartments or pouch, depending on the application thereof and the required needs. Suitable mixtures include for example mixtures wherein one polymer has a higher water-solubility than another polymer, and/or one polymer has a higher mechanical strength than another polymer. Also suitable are mixtures of polymers having different weight average molecular weights, for example a mixture of PVA or a copolymer thereof of a weight average molecular weight of about 10,000-40,000, preferably around 20,000, and of PVA or copolymer thereof, with a weight average molecular weight of about 100,000 to 300,000, preferably around 150,000. Also suitable herein are polymer blend compositions, for example comprising hydrolytically degradable and water-soluble polymer blends such as polylactide and polyvinyl alcohol, obtained by mixing polylactide and polyvinyl alcohol, typically comprising about 1-35% by weight polylactide and about 65% to 99% by weight polyvinyl alcohol. Preferred for use herein are polymers which are from about 60% to about 98% hydrolysed, preferably about 80% to about 90% hydrolysed, to improve the dissolution characteristics of the material.

Preferred films exhibit good dissolution in cold water, meaning unheated distilled water. Preferably such films exhibit good dissolution at temperatures of 24° C., even more preferably at 10° C. By good dissolution it is meant that the film exhibits water-solubility of at least 50%, preferably at least 75% or even at least 95%, as measured by the method set out here after using a glass-filter with a maximum pore size of 20 microns, described above.

Preferred films are those supplied by Monosol under the trade references M8630, M8900, M8779, M8310.

Of the total PVA resin content in the film described herein, the PVA resin can comprise about 30 to about 85 wt % of the first PVA polymer, or about 45 to about 55 wt % of the first PVA polymer. For example, the PVA resin can contain about 50 w.% of each PVA polymer, wherein the viscosity of the first PVA polymer is about 13 cP and the viscosity of the second PVA polymer is about 23 cP.

Naturally, different film material and/or films of different thickness may be employed in making the compartments of the present invention. A benefit in selecting different films is that the resulting compartments may exhibit different solubility or release characteristics.

The film material herein can also comprise one or more additive ingredients. For example, it can be beneficial to add plasticisers, for example glycerol, ethylene glycol, diethyleneglycol, propylene glycol, sorbitol and mixtures thereof. Other additives may include water and functional detergent additives, including surfactant, to be delivered to the wash water, for example organic polymeric dispersants, etc.

The film may be opaque, transparent or translucent. The film may comprise a printed area. The printed area may cover between 10 and 80% of the surface of the film; or between 10 and 80% of the surface of the film that is in contact with the internal space of the compartment; or between 10 and 80% of the surface of the film and between 10 and 80% of the surface of the compartment.

The area of print may cover an uninterrupted portion of the film or it may cover parts thereof, i.e. comprise smaller areas of print, the sum of which represents between 10 and 80% of the surface of the film or the surface of the film in contact with the internal space of the compartment or both.

The area of print may comprise inks, pigments, dyes, blueing agents or mixtures thereof. The area of print may be opaque, translucent or transparent.

The area of print may comprise a single colour or maybe comprise multiple colours, even three colours. The area of print may comprise white, black, blue, red colours, or a mixture thereof. The print may be present as a layer on the surface of the film or may at least partially penetrate into the film. The film will comprise a first side and a second side. The area of print may be present on either side of the film, or be present on both sides of the film. Alternatively, the area of print may be at least partially comprised within the film itself.

The area of print may comprise an ink, wherein the ink comprises a pigment. The ink for printing onto the film has preferably a desired dispersion grade in water. The ink may be of any color including white, red, and black. The ink may be a water-based ink comprising from 10% to 80% or from 20% to 60% or from 25% to 45% per weight of water. The ink may comprise from 20% to 90% or from 40% to 80% or from 50% to 75% per weight of solid. The ink may have a viscosity measured at 20° C. with a shear rate of 1000s⁻¹ between 1 and 600 cPs or between 50 and 350 cPs or between 100 and 300 cPs or between 150 and 250 cPs. The measurement may be obtained with a cone-plate geometry on a TA instruments AR-550 Rheometer.

The area of print may be achieved using standard techniques, such as flexographic printing or inkjet printing. Preferably, the area of print is achieved via flexographic printing, in which a film is printed, then moulded into the shape of an open compartment. This compartment is then filled with a detergent composition and a second film placed over the compartment and sealed to the first film. The area of print may be on either or both sides of the film.

Alternatively, an ink or pigment may be added during the manufacture of the film such that all or at least part of the film is coloured.

The film may comprise an aversive agent, for example a bittering agent. Suitable bittering agents include, but are not limited to, naringin, sucrose octaacetate, quinine hydrochloride, denatonium benzoate, or mixtures thereof. Any suitable level of aversive agent may be used in the film.

Suitable levels include, but are not limited to, 1 to 5000 ppm, or even 100 to 2500 ppm, or even 250 to 2000 rpm.

The unit dose article may comprise at least two compartments and the liquid laundry detergent composition is present in at least one compartment. The liquid laundry detergent composition may be present in a first compartment and a cellulase is present in a second compartment.

Method of Use

The composition or unit dose article of the present invention can be added to a wash liquor to which laundry is already present, or to which laundry is added. It may be used in an washing machine operation and added directly to the drum or to the dispenser drawer. The washing machine may be an automatic or semi-automatic washing machine. It may be used in combination with other laundry detergent compositions such as fabric softeners or stain removers. It may be used as pre-treat composition on a stain prior to being added to a wash liquor.

EXAMPLES

The viscosity of various compositions was investigated.

The following compositions were prepared;

TABLE 1 Weight in grams Batch 1 Batch 2 Batch 3 First composition comprising 580 580 832 anionic surfactant Second composition containing 420 hydrophobically modified hydroxymethylcellulose and carboxymethylcellulose and alcohol hydrophobically modified 67 67 hydroxymethylcellulose carboxymethylcellulose 101 101 alcohol 252

In batches 2 and 3, a second composition was not prepared, rather the polymers and/or alcohol were added separately and directly to composition 1.

The compositions were prepared using an IKA EUROSTAR 200 with a 10 cm diameter impeller and mixed at 250 rpm. Ingredients were weighed using a Mettler Toledo PB3002-S.

Viscosity was measured using Rheometer DHR 1 from TA instruments 24 h and 48 h after batch making. The Rheometer was used following the manufacturer's instructions and set as follows;

-   -   1 min equilibration at 0.05s-1     -   Flow curve from 0.05 to 1200 mPa.s in 10 min     -   Temperature: 20 C     -   Gap: 1000 um         Results can be seen in Table 2;

TABLE 2 48 h after making 0.5 s−1 20 s−1 100 s−1 mPa · s mPa · s mPa · s Batch 1 4.938 2.742 1.998 Batch 2 9.386 5.15 3.32 Batch 3 8.607 4.657 3.296

As can be seen Batch 1 has a much lower viscosity at all three shear rates recorded. A shear rate of 20 s-1 corresponds to that during pouring of the composition by a consumer and 100 s-1 corresponds to shear rate experienced during manufacture.

The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm.”

Every document cited herein, including any cross referenced or related patent or application, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, suggests or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.

While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention. 

What is claimed is:
 1. A liquid laundry detergent composition comprising an anionic surfactant, a hydrophobically modified hydroxethylcellulose, a carboxymethylcelluose and an alcohol, wherein the composition is obtained by the following steps: a. preparing a first composition comprising the anionic surfactant; b. preparing a second composition by mixing the alcohol, the hydroxyethylcellulose and the carboxymethylcellulose; c. adding the second composition to the first composition to make the liquid laundry detergent composition, wherein the alcohol has a molecular weight of between about 20 and about 400 and an eRH of between about 70% and about 100% at about 20° C. as measured via the alcohol eRH test described herein.
 2. The liquid laundry detergent composition according to claim 1 wherein the first composition comprises between about 10% and about 50%, by weight of the first composition of anionic surfactant.
 3. The liquid laundry detergent composition according to claim 2 wherein the first composition comprises between about 15% and about 45% by weight of the first composition of anionic surfactant
 4. The liquid laundry detergent composition according to claim 1 wherein the anionic surfactant is selected from linear alkylbenzene sulphonate, alkoxylated alkyl sulphate or mixtures thereof.
 5. The liquid laundry detergent composition according to claim 1 wherein the second composition comprises between about 10% and about 30% by weight of the second composition of the hydroxyethylcellulose.
 6. The liquid laundry detergent composition according to claim 5 wherein the second composition comprises between about 15% and about 25% by weight of the second composition of the hydroxyethylcellulose.
 7. The liquid laundry detergent composition according to claim 1 wherein the weight ratio of the hydroxyethylcellulose to the carboxymethylcellulose is between about 1:0.7 and about 1:2.
 8. The liquid laundry detergent composition according to claim 7 wherein the weight ratio of the hydroxyethylcellulose to the carboxymethylcellulose is between about 1:1 to about 1:1.5.
 9. The liquid laundry detergent composition according to claim 1 wherein the second composition comprises between about 40% and about 70%, by weight of the second composition of the hydrophobic solvent.
 10. The liquid laundry detergent composition according to claim 9 wherein the second composition comprises between about 50% and about 65% by weight of the second composition of the hydrophobic solvent.
 11. A water-soluble unit dose article comprising a water-soluble film and a liquid laundry detergent composition according to claim
 1. 12. The water-soluble unit dose article according to claim 11 wherein the unit dose article comprises at least two compartments and the liquid laundry detergent composition is present in at least one compartment.
 13. The water-soluble unit dose article according to claim 12 wherein the liquid laundry detergent composition is present in a first compartment and a cellulase is present in a second compartment.
 14. A concentrated polymer composition suitable for addition to a laundry detergent composition comprising: a. about 10% to about 30% by weight of the polymer composition of a hydroxyethylcellulose; b. a carboxymethylcellulose in a weight ratio of hydroxyethyl cellulose to carboxymethylcellulose of between about 1:0.7 and about 1:2, c. an alcohol, wherein the alcohol has a molecular weight of between about 20 and about 400 and an eRH of between about 70% and about 100% at 20° C. as measured via the alcohol eRH test described herein.
 15. The concentrated polymer system according to claim 14 comprising between about 15% and about 25% by weight of the polymer composition of a hydrophobically modified hydroxyethylcellulose.
 16. The concentrated polymer system according to claim 14 comprising a weight ratio of hydroxyethyl cellulose to carboxymethylcellulose of between about 1:1 and about 1:1.5.
 17. A liquid laundry detergent composition comprising an anionic surfactant, a hydrophobically modified hydroxethylcellulose, a carboxymethylcelluose and an alcohol, wherein the composition is obtained by the following steps: a. preparing a first composition comprising the anionic surfactant; b. preparing a second composition by mixing the alcohol, the hydroxyethylcellulose and the carboxymethylcellulose; c. adding the second composition to the first composition to make the liquid laundry detergent composition; wherein the alcohol is selected from the group comprising ethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, 2,3-butane diol, 1,3 butanediol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerol formal dipropylene glycol, dipropylene glycol methyl ether, propylene glycol monopropyl ether, tripropylene glycol, polypropylene glycol, dipropylene glycol n-butyl ether, and mixtures thereof.
 18. A liquid laundry detergent composition according to claim 17, wherein the alcohol is selected from the group consisting of dipropylene glycol methyl ether, dipropylene glycol, polypropylene glycol, 2,3-butane diol, dipropylene glycol n-butyl ether and mixtures thereof.
 19. A concentrated polymer composition suitable for addition to a laundry detergent composition comprising: a. about 10% to about 30% by weight of the polymer composition of a hydrophobically modified hydroxyethylcellulose; b. a carboxymethylcellulose in a weight ratio of hydroxyethyl cellulose to carboxymethylcellulose of between about 1:0.7 and about 1:2,; c. an alcohol selected from the group consisting of ethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, 2,3-butane diol, 1,3 butanediol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerol formal dipropylene glycol, dipropylene glycol methyl ether, propylene glycol monopropyl ether, tripropylene glycol, polypropylene glycol, dipropylene glycol n-butyl ether, and mixtures thereof, preferably the alcohol is selected from the group comprising dipropylene glycol methyl ether, dipropylene glycol, polypropylene glycol, 2,3-butane diol, dipropylene glycol n-butyl ether and mixtures thereof.
 20. The concentrated polymer system according to claim 19 comprising between about 15% and about 25% by weight of the polymer composition of a hydrophobically modified hydroxyethylcellulose.
 21. The concentrated polymer system according to claim 19 comprising a weight ratio of hydroxyethyl cellulose to carboxymethylcellulose of between about 1:1 and about 1:1.5.
 22. The concentrated polymer system according to claim 19, where the alcohol is selected from the group consisting of dipropylene glycol methyl ether, dipropylene glycol, polypropylene glycol, 2,3-butane diol, dipropylene glycol n-butyl ether and mixtures thereof. 